Show Posts: Selectors are not displayed

I have a little problem.I’m working my way through the YouTube tutorial How to Convert a Webflow… Episode 8. At minute 0:59 the Selector header is assigned the Smart Action Show posts. When selecting " The last repeated element" the Main Content area is assigned to the video. But in my case the Selectors are not displayed. I have saved everything. What am I doing wrong here?

From Video: